Muffler.



PATENTED MAY A.29, 1906.

L. J. PHELPS.

MUFFLER.

APPLICATION FILED .APR.10. 1905.

..34 .(14. III

UNITED STATES APATENT OFFICE.

`LUC1US J. PHELPS, OE STONEHAM, MASSACHUSETTS, ASSIGNOR, 'BY

MESNE ASSIGNMENTS, To SHAWMUT MOTOR COMPANY, OF BOS- TON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

MUFFLER.

Specification of Letters Patent.'

Patentedlay 29, 1906.

Application led April 1'0I 1905l Serial No. 254,797.

". To a/ZZ lwhom it may concern:

yfor use with Internal-combustion engines.

The requirements of the users of internal- 'combustion engines andv of high-pressure Steam-engineswithrespect to the disposition of the exhaust from such engines are conflicting in so far. as the provision for muiiiing or baling the exhaust for the sake of suppressing the explosive noise thereof has to a greater or less extent interfered with the attainment of., maximum efficiency by the engine itself by creatingback pressure. It is A well known that when the development of gine-e the highest eiiiciency of the engine is the dominant motive muffling devices are entirely removed, so that the exhaust shall be unrestricted, and itis well known also that therapid recurrence of ex losive exhausts when this condition reva s is a source of much annoyance. or all ordinary purposes and under normal working conditions the i presence of a muffler is indispensable upon launches, automobiles-carriages, and in many places also in connection with stationary power equipment. By the improvements herein to be described I have Succeeded in constructing a muffler which effebtivel suppresses the ex losive noise of enaust without at t e same time sensibly hampering the engine by the Creation of back ressure. Practical tests, such as hill-clim ing with an automobile-carriage,

as well as carefully-conducted gage tests have demonstrated that my improved muf-v fler leaves the exhaust practically unrestricted, while it dissipates and suppresses the explosive effects of the exhaust itself. By gage tests no measurable difference in back pressure is detected whether or not my muiiier is connected with the engine. v

In the drawings -hereto annexed, which illustratean embodiment of my inventionA in its preferred form, Figure 1 is a longitudinal view of a muffler, partly in cross-seci tion ;Fig. 2, across-section of the same viewed 5 5 toward llts dischargeend at line 2 2 of Fig. 1. Fig. 3 is a perspective view of one of the liningsections ofthe mufiier; and Figs. 4 and 5, details showing *one of -the perforated partitions `which enter into the'muffler construc- 6o tion, Fig. 5 being a cross-section of Fig. 4 at line'. l

' In Fig. 1 the exhaust-pipe from the engine is shown at D, Secured to the union A with the muffler-shell A. The shell A is a cylindrical sheet-metal tube, which is closed atI its discharge end by a cap A2. Perforations A4 in the cylindrical side of the muiiier-shell constitute 1ts dischar e-outlets, and a scoopshaped deflector-shie d A3 is externally se- 7o cured to the shell A Overthe discharge-Out# The shell A is of considerably larger diameter than the exhaust-pipe D, and the a gregate areaof the discharge-openings A4 is aIso preferably considerably cross-sectional area of the e aust-pipe D.

In order to break up'the explosive impact of the exhaust from the vipe D, I line the shell A with a reticulatedp lining or -a lining eater than the 7 5 which presents a 4closely-convoluted, corru- 8c gated, complicated, and preferably perforated surface. The lining /B is (preferably constructedin several sectlons, an the vform ,which I have found most advantageous is illustrated in Fig. 3. I l

Each section of the'lining B consists of a sheet of rather coarse-wovenwire bent into a pose of crimping the wires so as to prevent accidental unraveling of the same from the mesh and also serves to hold the muffler-partitions presentl to be described.

. The effect o the irregular surface of the by deflection in many mtersecting directions the impact of the entering exhaust and to prevent the shell A from giving forth .percussive sounds, which. itwil do 1f the exhaust explosions be not confused and dissipated in 10o artitions C. w

, b inclos- 'woven-Wire lining is to break up and dissipate 95 i being preferably considerably larger in area than the cross-section of the exhaust-pipe D.

The subdivision of the interior of the mufflershell A into sections or compartments by means of the partitions still further insures the suppression of the explosive effects of the exhaust. Again, the irregular and reticulated surface presentedby the woven wire of the partitions C assistsin breaking up by miscellaneous and diffused reflection the sound impacts of the exhaust, and the yielding consistency of the asbestos-felt disks further contributes to this effect. In arranging the perforations C2 of the 'partitions I have found it advantageous to oHset these from the center of the partition-disks and still further to arrange the disks in themuffler so that the perforations C2 shall be out of line with each other. This arrangement effectively prevents any exhaust explosion from communcatin its impact directly to the discharge en of the muffler-shell. The woven wire employed is of sufficiently coarse mesh to render the effective passa e-ways throu h thepartitions ample to disc arge freely t e exhausting gases, sol that the presence of an.

exhaust-pipe offers no measurable resistance to the exhaust. v

4 VVhen this muffler is attached to a motorcar'riage, it is by preference hung to the rear endth'ereof, vand in order to prevent the exhaust-blast from blowing directly downward, and thus unduly stirring up dust, I provide the scoop-shaped deflectingfshield A3,

which delivers the exhausting gases' to the 4o ters Patent, is-

1v. In a muffler, the combination of aV shell having an inlet and an'outlet, a lining composed of woven-wire sections flanged at their ends, and apertured partitions of asbestos felt held between sheets of woven Wire.

2. Ina mufller, the combination of a shell,

an inlet and an outlet therefor, a lining com posed of woven-wire sections, flanged at the ends, and partitions consisting of apertured plates of asbestos felt, clampedV between woven-wire sheets,1the said plates set with their apertures oHset.

3. In a mufller, the combination of a shell, a reticulated lining therefor, an inlet to the shell, an outlet therefrom consisting of lat- IIeral erforations, and a deflectin -shield secure to the shell outside the out et-perforations.

4. In a mufHer, the combination of a cylin vdrical shell, an inlet at one end thereof, a cap at the other end, and lateral outlet-perforations in the shell near the cap, a lining composed of woven wire, and apertured transverse partitions composed of asbestos sheets inclosed in woven wlre, and a scoop-shaped deflecting-shield securedv to the shell exter- :nally adjacent to the outlet-perforations.

' Signed by me at Boston, Massachusetts,

' this 4th day of April, 1905. frame with itsexhaust end at or near the LUCIUS J. PHELPS.

Witnesses:

JOSEPH T. BRENNAN, CHARLES D. WOODBERRY. 

